Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
41
A "nibble" is a group of:
Answer:
4 bits
A nibble is half of a byte, which is 4 bits. A nibble can be conveniently represented by a single hexadecimal digit.
42
The Unicode Consortium is responsible for:
Answer:
Developing and maintaining the Unicode Standard
The Unicode Consortium is a non-profit organization that coordinates the development of Unicode, approving new characters and updating the standard.
43
Which of these actions is NOT a standard file operation?
Answer:
Format
Formatting is an operation performed on an entire storage drive to prepare it for use; it is not an operation on an individual file.
44
What is the hexadecimal equivalent of the octal number (123)₈?
Answer:
(53)₁₆
First, convert (123)₈ to binary: 1 = 001, 2 = 010, 3 = 011. So, (001010011)₂. Now, regroup into sets of four from the right: (0101 0011). Convert to hexadecimal: 0101 = 5, 0011 = 3. The result is (53)₁₆.
45
What does the expression A · B (or simply AB) represent in Boolean algebra?
Answer:
A AND B
The multiplication dot (·) or simple concatenation (AB) is the standard notation for the logical AND operation in Boolean algebra.
46
The term "bit" is short for:
Answer:
Binary Digit
A "bit" is the smallest unit of data in a computer and represents a single binary digit, either a 0 or a 1.
47
According to De Morgan's Theorem, the expression NOT(A AND B) is equivalent to:
Answer:
is equivalent to:
De Morgan's theorems describe how to distribute a NOT operator over AND and OR. `(A · B)' = A' + B'` is one of the two fundamental laws.
48
What is the result of the binary addition 1 + 1?
Answer:
10 (0 with a carry of 1)
In binary, 1 + 1 equals 2 in decimal. The binary representation of 2 is (10)₂, which means the result in the current column is 0, and a 1 is carried over to the next column.
49
What is the largest decimal value that can be represented by a single hexadecimal digit?
Answer:
15
The hexadecimal digits are 0-9 and A-F. The digit 'F' represents the decimal value 15.
50
Which of these is NOT a valid hexadecimal number?
Answer:
10G
The hexadecimal system uses digits 0-9 and letters A-F. The letter 'G' is not a valid hexadecimal digit.